Journal
CHEMPHYSCHEM
Volume 11, Issue 1, Pages 260-268Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cphc.200900624
Keywords
chemical shifts; computational chemistry; ionic liquids; NMR spectroscopy; solid-state structures
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Room-temperature ionic liquids (RTILs) are gaining increasing interest and are considered part of the green chemistry paradigm due to their negligible vapour pressure and ease of recycling. Evidence of liquid-state order, observed by IR and Raman spectroscopy, diffraction studies, and simulated by ab initio methods, has been reported in the literature. Here quadrupolar nucler are used as NMR probes to extract information about the solid and possible residual order in the liquid state of RTILs. To this end, the anisotropic nature and field dependence of quadrupolar and chemical shift interactions, are exploited Relaxation time measurements and a searchh for residual second order quadrupolar coupling were employed to investigate the molecular motions present in the liquid state and infer what kind of order is present. The results obtained indicate that on a timescale of - 10(-8) sec or longer RTILs behave as isotropic liquids without residual order.
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